Furnace



March 9,1926. y 1,576,174k E."

T. w. cAsHMAN FURNACE l Filed Nov. a. 1922"?A 2 Sheets-Sheet 1 II A .a

f 4a 4 @L I I l I 1 I I I I I March 9 1926. A 1,576,174

r. w. cAsHMAN FURNACE Filed Nov; s. 1923 2 Sheets-.Sheet 2 Patented Mar. 9, 1926.

THOMAS WILLIAM CASHMAN, 0F LONDON, ENGLAND.

summon.

Appiieation area November s, 1923. seriai No. 673,617.

To all lwhom t may concern:

Be it known that I,4 THOMAS WILLIAM CASHMAN, a Subj ect of the King of England, and resident of 168a Strand, city of Lon don, in theKingdom of England, have invented certain new and useful Iinpiovements in Furnaces, of which the following is a specification. p

My invention relates to furnaces and more particularly to improved means of the kind adopted for effecting smoke consumption and fuel economy, in suchl a manner that one furnace will consume the smoke of another furnace, there being at least two furnaces of ordinary construction working conjointly.

The necessity and advantages as well as the general practice hitherto adopted for smoke consumption are too well known to need any particular reference in this specification. Y

I am aware that a ventilator was used in connection with a mixing chamber which mixed the whole of the combination gases with heated fresh air and which is then forced by the fan back through the water and steam space, thence into the furnace box and through perforated pipes beneath the grate.

My invention diders from known apparatus in that I draw the gases from the flues by a powerful fan, to increase the velocity of the gases and .create the necessary circulation essential for the proper working, i. e. to create forced draught in one boiler to get rid of the flue gases from other boilers so giving a better chemical combination, increasing the temperature of the lire, and reducing the amount 0f C() and unburnt carbon which is absolutely essential for complete combustion and fuel economy.

In addition I carry conduits externally of and separate from the furnace proper and can thereby adopt my construction to existing furnaces with a minimum of alteration.

According to this invention the conduits lead from the rear of the lues to a common shaft through which they are strongly drawn by a powerful fan and then forced along an upper external flue at the forward end of which are distributing branches to conduct the gases back to a series of perforated inlet tubes fitted below the fire bars or hearth.

In order that my invention may be clearly understood and readilyv carried into effect I will now proceed to describe the same fully with reference to the accompanying 'diagrammatic drawings, in which i liigure l is a side elevation 4of a boilerin Although three boilers are shown in these drawings, the invention is applicable toda two boiler installation or to` anynuvmber of boilers. il i, According to this invention 'smoke is drawn by a fan l from the rear of the furnace flues 2 through short vertical pipes 3 and transverse rear conduit 8b into a coniiiion shaft 3 and then forced through piping or passages t and along an upper longitudinalshaft 4C, at the forward end of which are branch pipes ab which conduct the gases back through down pipes 4b* to an inlet or inlets 5 leading to outlets beneath the lire where they issue directly beneath the fire bars or hearth and are consumed at once by the flames.

To improve this effect, the smoke and gases are caused to enter the furnace through a series of short tubes 6 closed at their ends, projecting from the main return conduit 5 beneath the fire, these tubes 6 being perforated or slotted suitably over their length.

The fan may be driven by a motor 7 or otherwise.

In operation, the flues of the boilers whose smoke is to be consumed are shut oif from the chimney by closing the dampers l1 usually provided for the purpose of controlling the draught. Simultaneously dampers 8 provided in pipes 3 are opened, so that the' whole of the combustion products of these c boilers are passed through the apparatus to the boiler which is intended to `consume said' products. This latter is the only boiler of the battery whose main lues remain open to the chimney 9 and closed to the apparatus, and'in which dampers 10 in the inlet pipes 5 are also open. Thus the whole products of combustion of the remaining boilers are passed through the ire of one boiler, which may be any desired one ofthe battery, i. e. that one which has the brightest fire. By this arrangement rubbish and coal of inferior quality can be burnt in all the boiler furnaces except one which has a more or less non-bituminous lire, into which the combustion products enter and are consumed. A

great economy in fuel cost is thus edected Without theusual @Ineke nuisance, While the WholeapparatusiseXternal of the furnaces, b oilers or other usual fixtures and may therefore be fitted: te exist-ins plant '1.1.1 the space of a few hours and Without interfering with the operation of saine, the. only,

structural alteration required being the reniov'al of a brick froniMftl-ie'A rear iiue of each furnace for the connection of pipes 3 thereto.l

It Will be seen that with this simplified construction very'l'ittle cost is entailedk and no'disniantling, "cutting and drilling of the boiler shelfnis` necessary in `application to existing boilers andA no. additional furnace is required, The invention .is applicable to na'rine or locomotive typesofboiler.` -Iclaim'-Uv n f `lifeans for effecting smoke oonsuniption in a` battery of furnacesY whereby the Whole smoke of any 0f the furnaces can be passed through the fire of any other of the furnaces, comprising in combination With furnace fines which lead directly to the chimney andl alie provided with dampers, a transverse C011- duit, short vertical pipes connecting the {iue of each furnace to said transverse conduit, a common shaft longitudinally disposed above said furnaces and'connected to said transverse conduit, a transverse branch pipe connected to said shaft, down pipes leading from said branch pipe to beneath the gratas ofA the furnaces, nieans, for controlling the entrances ofsaid'verticalpipes and' the exits of said down pipes,V and ineans for forcing flue gases through the pipe system, the Whole systein of pipes, conduits andy shaft being external of the furnaces and the boilers associated therewith, substantially asV described; f

THOMAS WILLLAM eAsHMAN, 

